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Distinguish water utilization strategies of trees growing on earth‐rocky mountainous area with transpiration and water isotopes

Water stress is regarded as a global challenge to forests. Unlike other water‐limited areas, the water use strategies of rocky mountainous forests, which play an important ecohydrological role, have not received sufficient attention. To prove our hypothesis that species adopt different water use str...

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Autores principales: Jia, Guodong, Liu, Ziqiang, Chen, Lixin, Yu, Xinxiao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5743539/
https://www.ncbi.nlm.nih.gov/pubmed/29299245
http://dx.doi.org/10.1002/ece3.3584
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author Jia, Guodong
Liu, Ziqiang
Chen, Lixin
Yu, Xinxiao
author_facet Jia, Guodong
Liu, Ziqiang
Chen, Lixin
Yu, Xinxiao
author_sort Jia, Guodong
collection PubMed
description Water stress is regarded as a global challenge to forests. Unlike other water‐limited areas, the water use strategies of rocky mountainous forests, which play an important ecohydrological role, have not received sufficient attention. To prove our hypothesis that species adopt different water use strategies to avoid competition of limited water resources, we used site abiotic monitoring, sap flow and stable isotope method to study the biophysiological responses and water use preferences of two commonly distributed forest species, Pinus tabuliformis (Pt) and Quercus variabilis (Qv). The results showed that Pt transpired higher than Qv. Pt was also prone to adopt isohydric water use strategy as it demonstrated sensitive stomatal control over water loss through transpiration. Qv developed cavitation which was reflected by the dropping E (c) in response to high vapor pressure deficit, concentrated peak sap flux density (J (s)), and enlarged hysteresis loop. Considering the average soil depth of 52.8 cm on the site, a common strategy shared by both species was the ability to tap water from deep soil layers (below 40 cm) when soil water was limited, and this contributed to the whole growing season transpiration. The contribution of surface layer water to plant water use increased and became the main water source for transpiration after rainfall. Qv was more efficient at using water from surface layer than Pt due to the developed surface root system when soil water content was not stressed. Our study proves that different water‐using strategies of co‐occurring species may be conducive to avoid competition of limited water resources to guarantee their survival. Knowledge of water stress‐coping strategies of trees has implications for the understanding and prediction of vegetation composition in similar areas and can facilitate forest management criteria for plantations.
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spelling pubmed-57435392018-01-03 Distinguish water utilization strategies of trees growing on earth‐rocky mountainous area with transpiration and water isotopes Jia, Guodong Liu, Ziqiang Chen, Lixin Yu, Xinxiao Ecol Evol Original Research Water stress is regarded as a global challenge to forests. Unlike other water‐limited areas, the water use strategies of rocky mountainous forests, which play an important ecohydrological role, have not received sufficient attention. To prove our hypothesis that species adopt different water use strategies to avoid competition of limited water resources, we used site abiotic monitoring, sap flow and stable isotope method to study the biophysiological responses and water use preferences of two commonly distributed forest species, Pinus tabuliformis (Pt) and Quercus variabilis (Qv). The results showed that Pt transpired higher than Qv. Pt was also prone to adopt isohydric water use strategy as it demonstrated sensitive stomatal control over water loss through transpiration. Qv developed cavitation which was reflected by the dropping E (c) in response to high vapor pressure deficit, concentrated peak sap flux density (J (s)), and enlarged hysteresis loop. Considering the average soil depth of 52.8 cm on the site, a common strategy shared by both species was the ability to tap water from deep soil layers (below 40 cm) when soil water was limited, and this contributed to the whole growing season transpiration. The contribution of surface layer water to plant water use increased and became the main water source for transpiration after rainfall. Qv was more efficient at using water from surface layer than Pt due to the developed surface root system when soil water content was not stressed. Our study proves that different water‐using strategies of co‐occurring species may be conducive to avoid competition of limited water resources to guarantee their survival. Knowledge of water stress‐coping strategies of trees has implications for the understanding and prediction of vegetation composition in similar areas and can facilitate forest management criteria for plantations. John Wiley and Sons Inc. 2017-11-05 /pmc/articles/PMC5743539/ /pubmed/29299245 http://dx.doi.org/10.1002/ece3.3584 Text en © 2017 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
Jia, Guodong
Liu, Ziqiang
Chen, Lixin
Yu, Xinxiao
Distinguish water utilization strategies of trees growing on earth‐rocky mountainous area with transpiration and water isotopes
title Distinguish water utilization strategies of trees growing on earth‐rocky mountainous area with transpiration and water isotopes
title_full Distinguish water utilization strategies of trees growing on earth‐rocky mountainous area with transpiration and water isotopes
title_fullStr Distinguish water utilization strategies of trees growing on earth‐rocky mountainous area with transpiration and water isotopes
title_full_unstemmed Distinguish water utilization strategies of trees growing on earth‐rocky mountainous area with transpiration and water isotopes
title_short Distinguish water utilization strategies of trees growing on earth‐rocky mountainous area with transpiration and water isotopes
title_sort distinguish water utilization strategies of trees growing on earth‐rocky mountainous area with transpiration and water isotopes
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5743539/
https://www.ncbi.nlm.nih.gov/pubmed/29299245
http://dx.doi.org/10.1002/ece3.3584
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